def _make_testerchain(mock_backend: bool = False) -> TesterBlockchain:
"""
https://github.com/ethereum/eth-tester # available-backends
"""
# Monkey patch to prevent gas adjustment
import eth
eth._utils.headers.GAS_LIMIT_MINIMUM = TEST_GAS_LIMIT
eth._utils.headers.GENESIS_GAS_LIMIT = TEST_GAS_LIMIT
eth.vm.forks.frontier.headers.GENESIS_GAS_LIMIT = TEST_GAS_LIMIT
# Monkey patch to prevent gas estimates
def _get_buffered_gas_estimate(web3, transaction, gas_buffer=100000):
return TEST_GAS_LIMIT
import web3
web3.eth.get_buffered_gas_estimate = _get_buffered_gas_estimate
# Create the blockchain
if mock_backend:
testerchain = MockBlockchain()
else:
testerchain = TesterBlockchain(eth_airdrop=True,
free_transactions=True)
return testerchain
from enum import Enum
from constant_sorrow.constants import (CONTRACT_ATTRIBUTE, CONTRACT_CALL,
TRANSACTION)
from hexbytes import HexBytes
from typing import Callable, Generator, Iterable, List, Type, Union
from unittest.mock import Mock
from nucypher.blockchain.eth import agents
from nucypher.blockchain.eth.agents import Agent, ContractAgency, EthereumContractAgent
from nucypher.blockchain.eth.constants import NULL_ADDRESS
from nucypher.blockchain.eth.interfaces import BlockchainInterfaceFactory
from tests.constants import MOCK_ETH_PROVIDER_URI
from tests.mock.interfaces import MockBlockchain
MOCK_TESTERCHAIN = MockBlockchain()
CACHED_MOCK_TESTERCHAIN = BlockchainInterfaceFactory.CachedInterface(
interface=MOCK_TESTERCHAIN, emitter=None)
BlockchainInterfaceFactory._interfaces[
MOCK_ETH_PROVIDER_URI] = CACHED_MOCK_TESTERCHAIN
CURRENT_BLOCK = MOCK_TESTERCHAIN.w3.eth.getBlock('latest')
class MockContractAgent:
FAKE_TX_HASH = HexBytes(b'FAKE29890FAKE8349804')
FAKE_RECEIPT = {
'transactionHash': FAKE_TX_HASH,
'gasUsed': 1,